Improvement in balanced slide-valves



A. 0. FR UK.

Balanced Slide-Valves.

N0.138,325, PatentedApril29.1873.

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ABRAHAM O. ERICK, OF WAYNESBOROUGH, PENNSYLVANIA.

IMPROVEMENT IN BALANCED SLIDE-VALVES.

Specification forming part of Letters Patent No. 138,325, dated April 29, 1873; application filed February 21, 1873.

To all whom it may concern:

Be it known that I, ABRAHAM 0. Farm, of Waynesborough, in the county of Franklin and State of Pennsylvania, have invented a new and Improved Balanced Slide-Valve, of which the following is a specification:

Myinvention is an improvement in the class A of hollow slide-valves provided. with flexible diaphragms'or packing-rings; and it consists in the arrangement of a flexible corrugated ring in connection with a valve formed of two parts, one sliding vertically within the other, all as hereinafter described.

Figure 1 is a longitudinal section through my improved balanced slide-valve and the steam-chest. Fig. 2 is a top view with the top of the steam-chest removed.

Similar letters of reference indicate corresponding parts.

A represents the valve with a hollow'cyl inder, B, on the top of it, extending half way or more to the top of the steam-chest, and with the exhaust-opening O communicating with the interior space of the cylinder. D is another hollow cylinder with a face, E, fitting on the top plate F of the steam-chest, and it extends down to the top of the cylinder B within a flanged ring, G, bolted on the top of B, being about as large in its exterior diameter as the interior diameter of B. H is the packing-ring, of copper or other soft flexible metal, which is clamped at its outer margin between the flange l of cylinder B and the flange J of ring G; and at the inner margin it is clamped between the end of D and a ring, K, which extends down in cylinder B a short distance and fits snugly. Thisring has an angular groove or corrugation, L, between the two circles in which it is clamped to the cylinders, which so disposes the metal as to allow it to bend or yield readily and sufficient ly for the necessary movement of the cylinder D to keep steam-tight against the top of the steam-chest, and thus exclude a sufficient portion of the valve from down pressure to have it balanced when steam is on.

This modeof packingthe two cylinders affords an absolutely steam-tight joint, with little or no friction, and is alike applicable to cylinders or square or other shapedl forms which it may sometimes be desirable to substitute for them.

To keep the cylinder D up when steam is shut oif, I have a nut, M, attached centrally to one, say by arms N, forthe support of an adjusting-screw, P, and arrange one or more springs, P, of any kind on the other in such manner as to hold the said cylinder up, as clearly shown in the drawing.

I propose to have the valve-rod connected to thecylinder B by a yoke or ring extending around it, so as to shift vertically so as not to bind the rod.

In the top of the flange E of cylinder D is a circular groove, to, with passages 11 leading, from it to the exhaust, the object of which is to exhaust the steam that may find its way between the flange and the plate F of the steam-chest, and thus insure its being kept tight on the said plate by the up pressure of the steam on the flange E.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The improved valve formed of the flexible corrugated ring H L, the inner ring K, cylinders B and D, and the outer flanged ring G, combined as shown and described.

2. The combination of the screw 1? and its jam-nut, the curved spring Q, arms N, and nut M, all arranged within the valve-cylinders A and B, and connected therewith, as shown and described.

ABRAHAM O. FRIGK.

Witnesses GEORGE R. HANSTIEN, EZRA FRICK. 

